Determination of glass transitions in novel cellulose polymers by synchrotron wide-angle X-ray scattering

Publisher:
Elsevier
Publication Type:
Journal Article
Citation:
Materials Today Communications, 2015, 2 pp. e49 - e54
Issue Date:
2015-03-01
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© 2014 Elsevier Ltd. Synchrotron wide angle X-ray scattering (WAXS) was used to measure the glass-transition temperature (T g ) values for various cellulosic materials including a novel cellulose ester. WAXS patterns were obtained of films cast on silicon nitride windows. Two strong scattering peaks were observed that correlated with the intramolecular repeating anhydroglucose unit (d=10.6-14.3Å) and an intermolecular packing spacing (d=4.4-4.5Å). Real-time measurements were made during temperature cycling over a range of 80-160°C at 5°C/min. Significant shifts in position, width and area for the peak assigned to the intermolecular arrangement of the pseudo-linear cellulose mixed-ester chains were correlated with temperature. The calculated T g mid-points correlated well with T g values determined by differential scanning calorimetry (DSC). This application of temperature-dependent WAXS measurements shows promise for T g determination in samples where shallow second-order transitions are observed by DSC and where other techniques are not applicable.
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